Autore: Encyclopedia American,
- The Encyclopedia Americana.Vol-2 / Encyclopedia Americana Corporation.
- The Encyclopedia Americana.Vol-3 / Encyclopedia Americana Corporation.
- The Encyclopedia Americana.Vol-5 / Encyclopedia Americana Corporation.
- The Encyclopedia Americana.Vol-6 / Encyclopedia Americana Corporation.
- The Encyclopedia Americana.Vol-7 / Encyclopedia Americana Corporation.
- The Encyclopedia Americana.Vol-9 / Encyclopedia Americana Corporation.